arch-satellite-attribute-program 0.32.0

Satellite attribute macro for defining a program
Documentation 
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use quote::{format_ident, quote};
use arch_satellite_lang_idl::types::Idl;

pub fn gen_utils_mod(idl: &Idl) -> proc_macro2::TokenStream {
    let account = gen_account(idl);
    // let event = gen_event(idl);

    quote! {
        /// Program utilities.
        pub mod utils {
            use super::*;

            #account
            // #event
        }
    }
}

fn gen_account(idl: &Idl) -> proc_macro2::TokenStream {
    let variants = idl
        .accounts
        .iter()
        .map(|acc| format_ident!("{}", acc.name))
        .map(|name| quote! { #name(#name) });
    let if_statements = idl.accounts.iter().map(|acc| {
        let name = format_ident!("{}", acc.name);
        quote! {
            if value.starts_with(#name::DISCRIMINATOR) {
                return #name::try_deserialize_unchecked(&mut &value[..])
                    .map(Self::#name)
                    .map_err(Into::into)
            }
        }
    });

    quote! {
        /// An enum that includes all accounts of the declared program as a tuple variant.
        ///
        /// See [`Self::try_from_bytes`] to create an instance from bytes.
        pub enum Account {
            #(#variants,)*
        }

        impl Account {
            /// Try to create an account based on the given bytes.
            ///
            /// This method returns an error if the discriminator of the given bytes don't match
            /// with any of the existing accounts, or if the deserialization fails.
            pub fn try_from_bytes(bytes: &[u8]) -> Result<Self> {
                Self::try_from(bytes)
            }
        }

        impl TryFrom<&[u8]> for Account {
            type Error = arch_satellite_lang::error::Error;

            fn try_from(value: &[u8]) -> Result<Self> {
                #(#if_statements)*
                Err(ProgramError::InvalidArgument.into())
            }
        }
    }
}

// fn gen_event(idl: &Idl) -> proc_macro2::TokenStream {
//     let variants = idl
//         .events
//         .iter()
//         .map(|ev| format_ident!("{}", ev.name))
//         .map(|name| quote! { #name(#name) });
//     let if_statements = idl.events.iter().map(|ev| {
//         let name = format_ident!("{}", ev.name);
//         quote! {
//             if value.starts_with(#name::DISCRIMINATOR) {
//                 return #name::try_from_slice(&value[#name::DISCRIMINATOR.len()..])
//                     .map(Self::#name)
//                     .map_err(Into::into)
//             }
//         }
//     });

//     quote! {
//         /// An enum that includes all events of the declared program as a tuple variant.
//         ///
//         /// See [`Self::try_from_bytes`] to create an instance from bytes.
//         pub enum Event {
//             #(#variants,)*
//         }

//         impl Event {
//             /// Try to create an event based on the given bytes.
//             ///
//             /// This method returns an error if the discriminator of the given bytes don't match
//             /// with any of the existing events, or if the deserialization fails.
//             pub fn try_from_bytes(bytes: &[u8]) -> Result<Self> {
//                 Self::try_from(bytes)
//             }
//         }

//         impl TryFrom<&[u8]> for Event {
//             type Error = arch_satellite_lang::error::Error;

//             fn try_from(value: &[u8]) -> Result<Self> {
//                 #(#if_statements)*
//                 Err(ProgramError::InvalidArgument.into())
//             }
//         }
//     }
// }